Macrotrachela plicata ( Bryce, 1892 )

Lee, Sue Yeon, Yoo, Jung Sun & Kim, Seung Tae, 2017, New records of 13 rotifers including Bryceella perpusilla Wilts et al., 2010 and Philodina lepta Wulfert, 1951 from Korea, Journal of Species Research 6, pp. 26-37 : 31-32

8. Macrotrachela plicata ( Bryce, 1892)

Callidina plicata Bryce, 1892, pp. 21-22 , pl. 2, fig. 1; Murray, 1908, pp. 196-197, pl. 2, figs. 14, 15.

Macrotrachela plicata : Montet, 1915, pp. 290-291, pl. 10, figs. 19a-b; Donner, 1965, p. 141, figs. 105a-l; Donner, 1971, p. 371, Abb. 4e-g.

Material examined. Two specimens found in wet leaf litter from Daegwallyeong, Pyeongchang-gun, Gangwon-do, 37°41 ʹ 19.7 ʺ N 128°45 ʹ 39.0 ʺ E, 5 June 2016.

Diagnosis. Corona wider than cingulum. Sulcus narrower than a half of pedicel width. Upper lip bilobed medially and as high as trochal discs. Disc retractor with a round projection medially. Teeth 2 + 1/1 + 2. Trunk, rump, foot and spurs very finely granulated. Preanal pseudosegment with round lateral margins. Lateral margin of anal pseudosegment swollen posteriorly.

Measurements. Total body length in feeding 279 μm. Greatest trunk width in feeding 78 μm. Corona width 50 μm. Cingulum pad width 40 μm. Spur length 11 μm.

Remarks. The disc retractor of this species has a round projection medially, which is observed between median lobes of the upper lip and has been incorrectly identified as a small obtuse process on the median notch of the upper lip. The longitudinal folds on the trunk are strong and finely granulated.

This species is cosmopolitan ( Donner, 1965) and has been reported from the eastern part of Turkey (Erzurum) by Kaya (2013), which was the first Asian record of it.

World distribution. Cosmopolitan.

Deposition. Deposited in the collection of the National Institute of Biological Resources, Incheon, Korea (ZII YIV0000004839, ZIIYGR0000000006).